一种新型可调谐环型腔掺饵光纤激光器输出特性的研究

理论分析了光纤光栅调谐量与光纤应力和拉伸系数间的关系,实验研究了环行腔掺铒光纤激光器的最佳输出耦合比、调谐波长与新型可调谐光纤光栅挤压长度的关系以及不同耦合比对激光线宽和调谐范围的影响。在最佳输出耦合比为9:1时得到3.8mW最大激光输出功率,在耦合比为7:3时最大调谐范围为7.85nm。     

新型光纤光栅线性调谐方法

报道了一种线性度极佳的光纤光栅波长调谐技术，调谐范围在１０ｎｍ，线性拟合度达到０．９９９８，并首次利用材料力学原理推导了这种线性调谐的理论关系式，此种技术在可望在光纤传感，光纤通信及激光技术等方面有重要应用前景。     

基于光纤平移的窄线宽可调谐Er3+/Yb3+共掺光纤激光器

针对输出耦合镜旋转调谐时输出光束方向变化问题，设计了一种光纤位置平移、而调谐输出光束方向不变的光纤激光器系统。运用光栅方程，分析了光纤平移的调谐机理；采用输出与反馈光束耦合模型，分析了输出增益线宽随光纤位置、光束半径的变化。理论分析表明:该光纤激光器可获得线宽小于0.2 nm的调谐激光输出。实验结果表明，该激光器在波长为1543.446 nm处获得的调谐输出功率最大，达到470 mW，计算的斜率效率为23.9 %；整个调谐区域达到36 nm，调谐范围内激光的3 dB线宽小于0.08 nm。     

程控宽带连续调谐外腔半导体激光器特性分析

对宽带调谐外腔半导体激光器进行了理论及实验研究,分析了其最大调谐范围和连续调谐条件,为宽带可调谐激光器的设计提供了依据。完成了实用化的程控宽带连续调上腔激光器,该器件调谐范围超过７５ｎｍ,波长重复性精度为１ｎｍ,分辨率为０．０１ｎｍ。     

可调谐掺铥光纤激光器线宽压缩及其超光谱吸收应用

可调谐二极管激光吸收光谱技术是一种应用非常广泛的吸收光谱测量技术.利用宽带可调谐窄线宽光源进行吸收光谱测量的超光谱吸收技术可以在单次扫描中获取一段连续光谱的所有吸收数据,可大大提高可调谐二极管激光吸收光谱技术的数据信息容量和光谱诊断能力.分析了在2μm波段对水进行超光谱吸收测量时对激光器输出线宽的具体要求.利用掺铥光纤在2μm波段较宽的发射谱,采用可调谐法布里-珀罗滤波器和光纤可饱和吸收体相结合的技术方案搭建了一台宽带调谐窄线宽的2μm光纤激光器.获得了1840—1900 nm约60 nm范围的调谐光谱输出,激光器静态线宽仅为0.05 nm.利用该光源对空气中水在2μm波段的吸收光谱数据进行了超光谱吸收测量,在1856—1886 nm约30 nm的光谱范围内分辨了35条水的吸收谱线.通过对不同线宽条件下1870—1880 nm范围内的理论吸收光谱数据进行对比发现,测量数据无法有效分辨分别位于1873 nm和1877 nm处与强吸收线相邻的两条吸收谱线,且测量结果与激光线宽在0.08 nm条件下的HITRAN2012光谱数据库最为接近.这表明,在动态扫描过程中激光器的线宽得到了展宽.     

宽带可调谐单频窄线宽光纤激光器

设计出一种集可调谐带通滤波器、高精度环形滤波器和光纤环形镜于一体的全光纤复合腔结构可调谐单频窄线宽光纤激光器。采用980 nm半导体激光器作为抽运源,掺镱光纤在谐振腔内分别作为增益介质和可饱和吸收体,成功实现波长为1030～1090 nm稳定的宽谱可调谐单频窄线宽激光输出。当抽运光的抽运功率为300 mW时,在波长为1070 nm处得到的输出功率最大,为18.5 mW,斜率效率达到7.95%,持续1 h内没有出现跳模现象,功率不稳定性小于1%;当抽运功率为200 mW时,利用延迟自外差法测量线宽,得到波长调谐范围内的平均线宽为8.7 kHz,弛豫振荡频率为64 kHz。     

基于悬臂梁的光纤光栅无啁啾线性调谐

设计了一种均质,等厚,等腰三角状悬臂梁,调节该梁自由端的挠度,实现了光纤光栅布拉格反射中心波长的线性无啁啾调谐（调谐范围４．５０ｎｍ）引入修正因子η＝０．７１后,理论值与实验结果基本一致,光栅与梁间刚性粘贴的质量影响反射谱形状。     

基于多模光纤滤波器的可调谐掺铒光纤激光器

研究了一种新型、全光纤、宽带可调谐环形腔掺铒光纤激光器。该激光器利用由单模-多模-单模光纤组成的滤波器实现波长可调谐及激光器的全光纤结构。该滤波器将多模光纤缠绕在偏振控制器上,两端分别与一段单模光纤相连,通过调整偏振控制器的状态,实现了中心波长1542～1560nm的不同激光输出。单波长连续可调谐激光器的波长可调范围为18nm,边模抑制比大于40dB,3dB线宽为0.096nm;进一步调整偏振控制器的状态和抽运功率,实验同时得到了连续可调谐的双波长、三波长等多波长激光输出。对于可调谐的多波长激光器,通过调整偏振控制器的状态,可实现波长间隔及输出中心波长两者可调。     

脉冲钛宝石激光器的双波长运转

报道了脉冲钛宝石激光器的双波长可调谐运转，双汉总能量达到４１．８ｍＪ，调谐范围大于１００ｎｍ并且研究了双波长运转时的竞争效应，增益损耗的影响，时域特性等。     

高速宽波长范围可调谐光纤激光器

研制了一台高速波长连续扫描光纤激光器。使用SOA作为增益介质,用高速可调谐法珀滤波器作为波长调谐器件,构成的环形腔激光器。测量结果表明,激光器的平均输出功率2.6mW,波长扫描范围40nm,波长扫描范围内功率波动范围小于±0.4dBm,线宽小于0.01nm,扫描速度达到2kHz。     

A tunable,frequency-doubled,continuous-wave dye laser using ADA

A tunable, continuous-wave, frequency-doubled, rhodamine 6G dye laser has been developed using an ADA crystal placed in an astigmatic and coma compensated cavity. Generated UV powers of the order of 30mW cw in a single direction in gaussian form over the range 292–302 nm have been obtained by temperature phase matching, and with a 4.5 W pump. Power output is affected by thermal phase mismatching, and is ultimately limited by thermal lensing. Two scanning systems have been developed; a broadband arrangement of linewidth 0.02 nm continuously tunable over a range of 2 nm, and a narrowband system of linewidth 0.002 nm continuously tunable over a range of 1 nm. The laser has been used to detect the Rydberg states of Rb up to a principal quantum of n = 74.     

Tunable, μs-pulsed ytterbium fiber laser system with a linewidth below 2.7 GHz

We report on a widely tunable, pulsed laser system with narrow spectral linewidth based on a continuous wave ytterbium fiber oscillator, a pulse shaper and a power amplifier stage. The system is tunable from 1055 nm to 1085 nm and provides a maximum pulse energy of 155 μJ with a pulse duration of 1-5 μs. The linewidth is less than 2.7 GHz over the whole tuning range.     

Wideband tunable laser phase noise reduction using single sideband modulation in an electro-optical feed-forward scheme

A wideband laser phase noise reduction scheme is introduced where the optical field of a laser is single sideband modulated with an electrical signal containing the discriminated phase noise of the laser. The proof-of-concept experiments on a commercially available 1549 nm distributed feedback laser show linewidth reduction from 7.5 MHz to 1.8 kHz without using large optical cavity resonators. This feed-forward scheme performs wideband phase noise cancellation independent of the light source and, as such, it is compatible with the original laser source tunability without requiring tunable optical components. By placing the proposed phase noise reduction system after a commercial tunable laser, a tunable coherent light source with kilohertz linewidth over a tuning range of 1530-1570 nm is demonstrated.     

Widely ultra-narrow linewidth 104 nm tunable all-fiber compact erbium-doped ring laser

A widely tunable narrow linewidth compact erbium-doped all-fiber ring laser with 104 nm tuning range was reported. An all-fiber Fabry-Perot filter (FFP-TF) was used to realize the laser tuning output, and the wavelength at constant voltage had high time stability. With the 8 m length erbium-doped fiber as gain medium, we realized widely tunable laser from 1513 to 1617 nm with the linewidth less than 40 pm at any wavelength. Pumped by the 976 nm laser diode, the fiber laser worked with slope efficiency of above 10% and threshold of less than 21 mW.     

Tunable second harmonic generation by phase-modulated ultrashort laser pulses

We report on the generation of tunable light around 400?nm by frequency-doubling ultrashort laser pulses whose spectral phase is modulated by a sum of sinusoidal functions. The linewidth of the ultraviolet band produced is narrower than 1?nm, in contrast to the 12?nm linewidth of the non-modulated incident spectrum. The influence of pixellation of the liquid crystal spatial light modulator on the efficiency of the phase-modulated second harmonic generation is discussed.     

Widely tunable,narrow linewidth Tm: YAG ceramic laser with a volume Bragg grating

We report on a widely tunable, narrow linewidth operation of a Tm:YAG ceramic laser. A volume Bragg grating is used in the cavity as a folding mirror for wavelength selection. The wavelength is tuned from 1956.2 to1995 nm, leading to a total tuning range of 38.7 nm. The linewidth is around 0.1 nm over the whole tuning range. A maximum output power of 1.51 W at 1990.5 nm is achieved at 37.8 W absorbed pump power.Different saturation behaviors are observed in the laser performances at different wavelengths.     

用于铷蒸气激光泵浦的窄线宽阵列半导体激光器

在激光二极管LD泵浦铷蒸气激光器中,窄线宽半导体激光是实现铷蒸气激光高效率输出的关键技术之一。基于体布拉格光栅（VBG）外腔技术,实现了40 W功率0.14 nm线宽的780 nm激光输出。采用半导体制冷片（TEC）控制VBG温度,使得该激光器空气中波长可从779.35 nm调谐至780.10 nm,可用于铷蒸气激光的高效泵浦。     

Tunable single-mode pulsed Ti3+:Sapphire laser injection-seeded by a continuous-wave Cr3+:LiSrAlF6 laser

Spectrally pure high-power tunable single-mode operation of a pulsed Ti³⁺:sapphire laser by a tunable injection-seeding is reported. The injection laser was a cw diode laser pumped, spectrally narrowed tunable Cr³⁺:LiSrAlF₆ (Cr³⁺:LiSAF) laser with a grating in the auxiliary cavity. Single-mode tunable operation of a pulsed Ti³⁺: sapphire ring oscillator was obtained at different wavelengths in the range between 818 nm and 848 nm with a typical linewidth of 0.006 cm^-1. To extend the applicability of this operation to a differential absorption lidar system, the single-mode Ti³⁺:sapphire oscillator output was amplified and a high energy output of 38 mJ was obtained with the same linewidth.